On December 24, 1968, in what was the most watched television broadcast to that date, the astronauts Bill Anders, Jim Lovell and Frank Borman of Apollo 8 surprised the world with a reading of the Creation from the Book of Genesis as they orbited the moon. Madalyn Murray O'Hair, an atheist activist, filed a lawsuit under the Establishment Clause of the First Amendment. The suit was dismissed by the US Supreme Court.

In 1969, the United States Postal Service issued a stamp (Scott # 1371) commemorating the Apollo 8 flight around the moon. The stamp featured a detail of the famous photograph of the Earthrise over the moon (NASA image AS8-14-2383HR) taken by Anders on Christmas Eve, and the words, "In the beginning God

One of the mythic events of World War I, the 1914 Christmas Truce began on Christmas Eve along the British and German lines around Ypres, Belgium. While it took hold in some areas manned by the French and Belgians, it was not as widespread as these nations viewed the Germans as invaders. Along the 27 miles of front manned by the British Expeditionary Force, Christmas Eve 1914 began as a normal day with firing on both sides. While in some areas firing began to slacken through the afternoon, in others it continued at its regular pace.